Nuclear Data Sheets for A=186

Abstract

Evaluated spectroscopic data and level schemes from radioactive decay and nuclear reaction studies are presented for 186Lu, 186Hf, 186Ta, 186W, 186Re, 186Os, 186Ir, 186Pt, 186Au, 186Hg, 186Tl, 186Pb, 186Bi, and 186Po. This evaluation for A=186 supersedes the earlier evaluation 2003Ba44 by C. M. Baglin. Highlights of this evaluation are the following: 186Re: Revised %ε and %β− branches. New values are almost same as of the earlier ones. Adopted improved level energy for the long-lived (8+) isomer at 148.2 keV 5 based on the study reported in 2015Ma60 (187Re(n, 2nγ)) compared to 149 keV 7 in previous evaluation (2003Ba44). 186Hg: Discrepancies in the level schemes between 1992Po01 and 1993Ma02 remain to resolve experimentally, arise primarily due to the assigned multipolarity of the ≈607 keV γ transition between the 1228 keV bandhead and the 2+ 621 keV level. See general comments in Adopted Levels, Gammas dataset. 186Tl: From α decay studies, 2020St11 propose spin-parity (2−) for the g.s. and (7+) for the excited level at 0.0+x of level energy of 77 keV 56. From mass measurements, 2014Bo26 propose the (7−) level energy of 20 keV 40 earlier.